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Hartz UltraGuard Plus Flea & Tick Collar for Dogs, Medium & Large Breeds, 1 Collar (7-mos. supply)

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About This Item

Details

  • Provides full body protection from fleas and ticks for up to 7 months and can kill and even prevent flea eggs for up to 7 months—stopping the flea life cycle to help prevent reinfestation.
  • Specially designed for large dogs and can be adjusted to fit necks up to 22 inches.
  • Water resistant collar continues to fight fleas when wet and allows your dog to play in the rain, take a bath and even go for a swim without removing.
  • Kills through contact—eliminates fleas and ticks.
  • Proudly made in the USA.

Ingredients

Instructions

Size

FAQ

Important Information

Fleas rise to the top of your pet's coat as they die, so consider it a triumph if you start seeing more fleas at first, after treating your pet. If you’re still seeing fleas after application, it may be because your pet has picked up new fleas from the environment, which may include other pets, surfaces and outdoor areas. It may take up to 30 days to break the entire flea life cycle. Additionally, you should also treat sources of new fleas (i.e., carpet, yard, etc.) to ensure complete flea control.

About Hartz Ultraguard Dog Collars

Why Choose a Hartz Flea & Tick Collar?

Hartz Flea & Tick Collars provide convenient, mess-free flea and tick protection. Easy to put on and adjust for comfort, they can be worn alongside your dog’s regular collar.

How Hartz Flea & Tick Collars Work

Hartz Flea & Tick Dog Collars contain active ingredients that are slowly released and distributed over your dog’s body. These active ingredients kill and repel fleas and ticks to keep your pup pest-free and happy.

Long-Lasting Flea & Tick Protection

Pest Protection

Hartz UltraGuard dog collars kill and repel fleas and ticks and can be worn with your dog’s regular collar.

Full Body Protection

The active ingredients spread across your dog’s skin, providing continuous, full-body coverage for up to 6 months.

Water Resistant

UltraGuard collars are water-resistant, so they won’t lose their effectiveness if your pup takes a stroll in the rain.

Don’t Settle for Stiff

Hartz UltraGuard collars are soft and flexible to provide comfortable flea and tick protection.

About Hartz

For more than 95 years, Hartz has been dedicated to creating products that show pets the same unconditional love they give us. Hartz is a leader in quality, innovative products for dogs and cats, including Oinkies, Delectables, UltraGuard, Nature’s Shield, Home Protection, Comfitables, and Groomer's Best brands. Through the Hartz Loving Paws shelter outreach program, Hartz is committed to helping animal welfare organizations that protect and care for pets until they find their forever homes.

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Questions & Answers

8 Customer Questions

How long does this need to be worn?

Answer by Chewy • Mar 07, 2022
This collar provides full body protection from fleas and ticks for up to 7 months.

What specific types of ticks does the collar protect from?

Answer by Chewy • Aug 03, 2021
The UltraGuard Plus Flea & Tick Collar for Dogs will protect from Brown Dog and Deer ticks only.

I have Minnie poodles 13 pounds will it work

Answer by Chewy • May 29, 2022
This flea and tick collar is suitable for Medium and Large breed dogs only. It fits dogs with necks that measure up to 22 inches. We recommend the Hartz UltraGuard Plus Dog Flea & Tick Collar for Dogs, X-Small & Toy & Small Breeds available on our site.

is it waterproof

Answer by Chewy • May 13, 2022
This collar is water-resistant. Wetting the collar will not impair its effectiveness or the pet's protection. If the pet goes swimming or is out in the rain, it is not necessary to remove the collar.
Reviews
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4.1
Rated 4.1 out of 5 stars
593 Ratings
Terms & Conditions

Customers Mention

Chewy identifies key considerations with the help of artificial intelligence and our veterinarians.

Active Ingredients

60% Positive

Comfort and Fit

67% Positive

Duration of Protection

57% Positive

Effectiveness

60% Positive

172 Customer Reviews

Always consult a veterinarian about your pet’s health needs. Customer reviews should not be used as medical advice.

Rated 5 out of 5 stars
Verified Purchase
By Rob on Apr 15, 2026

Price

As again with 2 dogs vet bills etc stack up. I live on disability and these collars have great reviews and are A LOT cheaper than other brands and work great! All

As again with 2 dogs vet bills etc stack up. I live on disability and these collars have great reviews and are A LOT cheaper than other brands and work great! All my friends have had ticks on their furry friends and haven't had any on mine

Rated 5 out of 5 stars
Verified Purchase
By Sweetie on Mar 18, 2022

Hartz flee and tick collar

I tried this collar for the 1st time on my dog, and it works great! I'm so glad it worked, because the last collar I used that cost $28.00 did NOT work but for three

I tried this collar for the 1st time on my dog, and it works great! I'm so glad it worked, because the last collar I used that cost $28.00 did NOT work but for three days, then my dog was scratching horribly so. I went on Chewy and ordered the Hertz collar 3 months ago, and it is still working!!! Thank you Hertz, and thank you Chewy for selling this product!!

Rated 5 out of 5 stars
Verified Purchase
By Ann on Jul 30, 2025

Hart Flea Collar

Great product. The first time my dog wore it was last summer because he had a very bad flea infestation. He was losing a lot of fur and nothing we used was helping

Great product. The first time my dog wore it was last summer because he had a very bad flea infestation. He was losing a lot of fur and nothing we used was helping much. I tried Hartz and notice after a few weeks that my dog wasn't itching as much and all of the fur he lost eventually grew back. He wore the collar through the fall and spring, so this summer I stocked up on Hartz again. Now my little guy is happy again.

Rated 5 out of 5 stars
Verified Purchase
By Idie on Aug 7, 2025

Works just fine

Two years and no fleas, ticks, or side affects from the collar. Also love Chewy, the business, and wish all businesses were as customer oriented and just plain

Two years and no fleas, ticks, or side affects from the collar. Also love Chewy, the business, and wish all businesses were as customer oriented and just plain kind and professional. I’ve never had a bad experience with Chewy as they are very accommodating to their clients! Bravo Chewy!!

Rated 4 out of 5 stars
Verified Purchase
By Priscilla on Sep 22, 2025

These flea collars work great!

These collars work great. And they do last up to 7 months. My cat and dog started getting fleas about 7 months after I got these collars. So I bought some more,

These collars work great. And they do last up to 7 months. My cat and dog started getting fleas about 7 months after I got these collars. So I bought some more, bathed them both, put on their new collars and they don't scratch and chew anymore!

Rated 4 out of 5 stars
Verified Purchase
By Roxann on Apr 14, 2025

Flea and Tick Collar

I really like this collar for my dog. I have been buying the same one now for 3 years. They are the best No fleas or ticks on my dog and we go camping a lot so he

I really like this collar for my dog. I have been buying the same one now for 3 years. They are the best No fleas or ticks on my dog and we go camping a lot so he is out in long grass and woods.

Rated 5 out of 5 stars
Verified Purchase
By Ashlee on Apr 4, 2021

This really works!

After my dog brought fleas in last year, I spent 3 months using flea drops on the cat and dog trying to get rid of the nasty things. 3 months and over $100 on expensive

After my dog brought fleas in last year, I spent 3 months using flea drops on the cat and dog trying to get rid of the nasty things. 3 months and over $100 on expensive flea drops later, we still had fleas! So I had to stop the drops, wait a whole month, then I decided to try this $5 collar and a week later the fleas were gone. Definitely recommend to anyone who really wants to get rid of fleas. Neither of my animals had any negative effects from the collars (a 1 year old cat and an 11 year old dog).

Rated 5 out of 5 stars
By Helen on Jun 18, 2021

Tick Free Finally

We live in a wooded area and struggling keeping ticks off our 2 dogs. We have companies come out and spray and still can nightly find a tick on a pet which is

We live in a wooded area and struggling keeping ticks off our 2 dogs. We have companies come out and spray and still can nightly find a tick on a pet which is alarming. I was offered to try a UltraGuard ProMAX Dog Collar - Black collar for free. I was thrilled to be able to try something else out and was even more excited to report NO ticks for the last month. The best part about these collars is there is no awful smell like some flea and tick collars have. The collar is adjustable and can be used for any size dog.

Rated 5 out of 5 stars
Verified Purchase
By Redhed on May 17, 2021

works great!

I put this on my dog and the same evening I watched the mosquitos staying away! I am very happy with this Flea and tick collar.

I put this on my dog and the same evening I watched the mosquitos staying away! I am very happy with this Flea and tick collar.

Rated 5 out of 5 stars
Verified Purchase
By Becky on Jul 26, 2021

Works great

After battling ticks/flea bites for the early part of spring, I am happy to report that this Hartz Ultra Guard Plus has worked wonders for my Pug! Since wearing

After battling ticks/flea bites for the early part of spring, I am happy to report that this Hartz Ultra Guard Plus has worked wonders for my Pug! Since wearing the collar, we have not had one incident of ticks or flea bites. My dogs cannot wear topical flea/tick medication so the collar was my last resort and did not disappoint.